Linux Kernel Network Subsystem Patching

[David Thornton]

I replied to a message way further "up" in the thread... I've since read
the whole thread now. Oops.


On Sat, Feb 1, 2014 at 7:01 PM, David Thornton <northdot9-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> wrote:

> But I think your missing the point of the question: "What is the effect of
> hyperthreading versus multiple core, with respect to dead locks?". I think
> the answer is nothing. From a dead lock perspective, it's the same problem
> : O'Leary is dead and O'reily don't know it, O'reily is dead and O'Leary don't
> know it ( http://www.youtube.com/watch?v=YZWpffswMnM ).  Two threads /
> Processes depend on each-other to get something done,
> http://en.wikipedia.org/wiki/Deadlock . It doesn't matter of those two
> threads / process are in their own thread or core, they are still waiting
> on each other.
>
> David
>
>
> On Tue, Jan 21, 2014 at 5:42 PM, Lennart Sorensen <
> lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org> wrote:
>
>> On Tue, Jan 21, 2014 at 04:26:24PM -0500, Bob Jonkman wrote:
>> > -----BEGIN PGP SIGNED MESSAGE-----
>> > Hash: SHA1
>> >
>> > Is there a difference between hyperthreading and multithreading?
>> >
>> > (Not a snark -- I really don't know, and would like to...)
>>
>> Hyperthreading is one way to give you multiple hardware threads.
>> Actual seperate cores is another way.  To software there is no
>> difference between a CPU core and a CPU thread.  Every core has at
>> least one hardware thread.  Hyperthreading gives each core 2 threads
>> (in all current implementations).  power6 has 2 threads per core of SMT,
>> and power7 has 4 threads per core.  power8 is likely to have 8 threads
>> per core.
>>
>> Multithreading is multiple threads in a process.  Every process has
>> at least one thread (if it has more than the first one, then it is a
>> multithreaded program).  The system runs one thread on one CPU at any
>> given time, so a multithreaded program could be using multiple cores at
>> once, or at least multiple hardware threads on a core.
>>
>> The hardware threads share some resources, such as execution units,
>> but do not share CPU registers.  Each CPU core on the other hand is
>> independant (in general.  AMD's newer chips is starting the share the
>> FPU between two cores in interesting ways, without sharing anything else).
>>
>> --
>> Len Sorensen
>> --
>> The Toronto Linux Users Group.      Meetings: http://gtalug.org/
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>
>
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